Ratio of inertia force to elastic force is known as _____________________?
(A) Mach number
(B) Froude number
(C) Reynold’s number
(D) Weber’s number
(D) none of the above
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
(A) 10 m/sec
(B) 25 m/sec
(C) 2 m/sec
(D) 50 m/sec
(D) 250 m/sec
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
(A) 1 : 5
(B) 1 : 2.5
(C) 1 :25
(D) 1:V5″
(D) 1 : 53/2
For a floating body to be in stable equilibrium, its metacentre should be_________________ ?
(A) below the center of gravity
(B) below the center of buoyancy
(C) above the center of buoyancy
(D) between e.g. and center of pressure
(D) above the center of gravity
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
(A) 900 minutes
(B) 4 minutes
(C) 4 x (225)3/2 minutes
(D) 4 (225)1/3 minutes
(D) 4 x V225 minutes
When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
(A) e.g. of body
(B) center of pressure
(C) center of buoyancy
(D) metacentre
(D) liquid surface
Ratio of inertia force to surface Jension is known as ________________________?
(A) Mach number
(B) Froude number
(C) Reynold’s number
(D) Weber’s number
(D) none of the above
Buoyant force is___________________?
(A) resultant force acting on a floating body
(B) equal to the volume of liquid displaced
(C) force necessary to keep a body in equilibrium
(D) the resultant force on a body due to the fluid surrounding it
(D) none of the above
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be ___________________?
(A) 1000 kg
(B) 4000 kg
(C) 2000 kg
(D) 8000 kg
(D) 16000 kg
The normal stress is same in all directions at a point in a fluid ___________________?
(A) only when the fluid is frictionless
(B) only when the fluid is incompressible and has zero viscosity
(C) when there is no motion of one fluid layer relative to an adjacent layer
(D) irrespective of the motion of one fluid layer relative to an adjacent layer
(D) in case of an ideal fluid